lib/librte_eal/common/eal_common_vdev.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2016 RehiveTech. All rights reserved.
   5  *
   6  *   Redistribution and use in source and binary forms, with or without
   7  *   modification, are permitted provided that the following conditions
   8  *   are met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above copyright
  13  *       notice, this list of conditions and the following disclaimer in
  14  *       the documentation and/or other materials provided with the
  15  *       distribution.
  16  *     * Neither the name of RehiveTech nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <string.h>
  34 #include <inttypes.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stdint.h>
  38 #include <sys/queue.h>
  39
  40 #include <rte_vdev.h>
  41 #include <rte_common.h>
  42
  43 struct vdev_driver_list vdev_driver_list =
  44         TAILQ_HEAD_INITIALIZER(vdev_driver_list);
  45
  46 /* register a driver */
  47 void
  48 rte_eal_vdrv_register(struct rte_vdev_driver *driver)
  49 {
  50         TAILQ_INSERT_TAIL(&vdev_driver_list, driver, next);
  51 }
  52
  53 /* unregister a driver */
  54 void
  55 rte_eal_vdrv_unregister(struct rte_vdev_driver *driver)
  56 {
  57         TAILQ_REMOVE(&vdev_driver_list, driver, next);
  58 }
  59
  60 int
  61 rte_eal_vdev_init(const char *name, const char *args)
  62 {
  63         struct rte_vdev_driver *driver;
  64
  65         if (name == NULL)
  66                 return -EINVAL;
  67
  68         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
  69                 if (driver->driver.type != PMD_VDEV)
  70                         continue;
  71
  72                 /*
  73                  * search a driver prefix in virtual device name.
  74                  * For example, if the driver is pcap PMD, driver->name
  75                  * will be "eth_pcap", but "name" will be "eth_pcapN".
  76                  * So use strncmp to compare.
  77                  */
  78                 if (!strncmp(driver->driver.name, name,
  79                             strlen(driver->driver.name)))
  80                         return driver->driver.init(name, args);
  81         }
  82
  83         RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
  84         return -EINVAL;
  85 }
  86
  87 int
  88 rte_eal_vdev_uninit(const char *name)
  89 {
  90         struct rte_vdev_driver *driver;
  91
  92         if (name == NULL)
  93                 return -EINVAL;
  94
  95         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
  96                 if (driver->driver.type != PMD_VDEV)
  97                         continue;
  98
  99                 /*
 100                  * search a driver prefix in virtual device name.
 101                  * For example, if the driver is pcap PMD, driver->name
 102                  * will be "eth_pcap", but "name" will be "eth_pcapN".
 103                  * So use strncmp to compare.
 104                  */
 105                 if (!strncmp(driver->driver.name, name,
 106                              strlen(driver->driver.name)))
 107                         return driver->driver.uninit(name);
 108         }
 109
 110         RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
 111         return -EINVAL;
 112 }